- American Association for Klinefelter Syndrome Information and Support (AAKSIS)
- Klinefelter Syndrome from the Turner Center, a center for information, counselling and research on chromosome anomalies [Denmark]
- Klinefelter Syndrome: International Support Groups and links to more information
- Understanding Klinefelter Syndrome: A Guide for XXY Males and Their Families from the National Institutes of Health (NIH), Health & Human Development


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